There are three numbers of resistors having values of 30 ohm, 40 ohm and 50 ohm connected in parallel. What resistance must be connected in series with the parallel combination to obtain a total resistance of 20 ohm?
Answers
Answer:
If the three resistors of 40 ohm, 50 ohm and 30 ohm are connected in series with 12 v DC supply, what are the current and branch voltages?
Base formula;
E=I*R
E is volts
I is current
R is resistance
Adapted formula with known values;
Et=It*Rt
Et is total voltage =12
It is total current = (?)
Rt is total resistance = (R1=40+R2=50+R3=30) = 120 ohms
To find total current in amps through circuit.
Modified formula to find unknown value;
It = Et/Rt = 12/120 = 0.1 amps
It = 12/120 = 0.1 amp
To find the voltage drop across each resister
Adapted formula with found values;
En = It*Rn
E1 = It*R1 = 0.1*40 = 4 volt drop across resister 1
E2 = It*R2 = 0.1*50 = 5 volt drop across resister 2
E3 = It*R3 = 0.1*30 = 3 volt drop across resister 3
Explanation:
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